Genetics Comprehensive Mutation Analysis by Whole-Exome Sequencing in 41 Chinese Families With Leber Congenital Amaurosis Yabin Chen,1 Qingyan Zhang,2 Tao Shen,1 Xueshan Xiao,1 Shiqiang Li,1 Liping Guan,2 Jianguo Zhang,2 Zhihong Zhu,2 Ye Yin,2 Panfeng Wang,1 Xiangming Guo,1 Jun Wang,2 and Qingjiong Zhang1 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China 2BGI-Shenzhen, Shenzhen, China Correspondence: Qingjiong Zhang, PURPOSE. Leber congenital amaurosis (LCA) is a genetically heterogeneous disease with, to State Key Laboratory of Ophthal- date, 19 identified causative genes. Our aim was to evaluate the mutations in all 19 genes in mology, Zhongshan Ophthalmic Chinese families with LCA. Center, Sun Yat-sen University, 54 Xianlie Road, Guangzhou 510060, METHODS. LCA patients from 41 unrelated Chinese families were enrolled, including 25 China; previously unanalyzed families and 16 families screened previously by Sanger sequencing, but
[email protected]. with no identified mutations. Genetic variations were screened by whole-exome sequencing YC, QZ, JW, and QZ contributed and then validated using Sanger sequencing. equally to the work presented here RESULTS. A total of 41 variants predicted to affect protein coding or splicing was detected by and should therefore be regarded as whole-exome sequencing, and 40 were confirmed by Sanger sequencing. Bioinformatic and equivalent authors. segregation analyses revealed 22 potentially pathogenic variants (17 novel) in 15 probands, Submitted: January 4, 2013 comprised of 3 of 16 previously analyzed families and 12 of 25 (48%) previously unanalyzed Accepted: April 29, 2013 families. In the latter 12 families, mutations were found in CEP290 (three probands); Citation: Chen Y, Zhang Q, Shen T, et GUCY2D (two probands); and CRB1, CRX, RPE65, IQCB1, LCA5, TULP1, and IMPDH1 (one al.